Indebtedness	6 Months Ended
Jun. 30, 2016
Indebtedness
Indebtedness	Note 5. Indebtedness Our principal debt obligations at June 30, 2016 were: (1) outstanding borrowings under our $1,000,000 unsecured revolving credit facility; (2) six public issuances of senior unsecured notes, including: (a) $400,000 principal amount at an annual interest rate of 3.25% due 2019, (b) $200,000 principal amount at an annual interest rate of 6.75% due 2020, (c) $300,000 principal amount at an annual interest rate of 6.75% due 2021, (d) $250,000 principal amount at an annual interest rate of 4.75% due 2024, (e) $350,000 principal amount at an annual interest rate of 5.625% due 2042 and (f) $250,000 principal amount at an annual interest rate of 6.25% due 2046; (3) our $350,000 principal amount term loan due 2020; (4) our $200,000 principal amount term loan due 2022; and (5) $636,087 aggregate principal amount of mortgages (excluding premiums, discounts and net debt issuance costs) secured by 54 of our properties (55 buildings) with maturity dates between 2016 and 2043. The 54 mortgaged properties (55 buildings) had a carrying value (before accumulated depreciation) of $1,040,792 at June 30, 2016. We also had two properties subject to capital leases with lease obligations totaling $11,817 at June 30, 2016; these two properties had a carrying value (before accumulated depreciation) of $36,039 at June 30, 2016, and the capital leases expire in 2026. In February 2016, we issued $250,000 of 6.25% senior unsecured notes due 2046, and raised net proceeds of approximately $241,350 after underwriting discounts and expenses. We used the net proceeds of this offering to repay in part the outstanding amount under our revolving credit facility and for general business purposes. In July 2016, we entered into loan agreements and obtained an aggregate $620,000 secured debt financing that matures in August 2026. These loans are secured by one MOB (two buildings) located in Massachusetts and require interest at a weighted average fixed annual interest rate of 3.53%. We used the net proceeds from these loans to repay in part the outstanding amount under our revolving credit facility and for general business purposes. The loan agreements contain customary covenants and provide for acceleration of payment of all amounts due thereunder upon the occurrence and continuation of certain events of default. We have a $1,000,000 revolving credit facility that is available for general business purposes, including acquisitions. The maturity date of our revolving credit facility is January 15, 2018 and, subject to our payment of an extension fee and meeting other conditions, we have an option to extend the stated maturity date by an additional year to January 15, 2019. Our revolving credit facility provides that we can borrow, repay and re-borrow funds available under our revolving credit facility until maturity, and no principal repayment is due until maturity. Our revolving credit facility requires annual interest to be paid on borrowings at LIBOR plus a premium, which was 130 basis points as of June 30, 2016, plus a facility fee of 30 basis points per annum on the total amount of lending commitments. Both the interest rate premium and the facility fee are subject to adjustment based upon changes to our credit ratings. As of June 30, 2016, the annual interest rate payable on borrowings under our revolving credit facility was 1.7%. The weighted average annual interest rates for borrowings under our revolving credit facility were 1.7% and 1.5% for the three months ended June 30, 2016 and 2015, respectively, and 1.7% and 1.5% for the six months ended June 30, 2016 and 2015, respectively. As of June 30, 2016, we had $749,000 outstanding and $251,000 available for borrowing, and as of August 4, 2016, we had $100,000 outstanding and $900,000 available for borrowing under our revolving credit facility. We incurred interest expense and other associated costs related to our revolving credit facility of $3,454 and $2,063 for the three months ended June 30, 2016 and 2015, respectively. We incurred interest expense and other associated costs related to our revolving credit facility of $7,136 and $3,003 for the six months ended June 30, 2016 and 2015, respectively. Our revolving credit facility includes an accordion feature pursuant to which maximum borrowings under the facility may be increased to up to $1,500,000 in certain circumstances. We have a $200,000 term loan, which we borrowed in 2015. This term loan matures in September 2022 and is prepayable without penalty beginning September 29, 2017. This term loan requires annual interest to be paid at LIBOR plus a premium of 180 basis points that is subject to adjustment based upon changes to our credit ratings. As of June 30, 2016, the annual interest rate payable for amounts outstanding under this term loan was 2.3%. The weighted average annual interest rate for amounts outstanding under this term loan was 2.3% for both the three and six months ended June 30, 2016. We incurred interest expense and other associated costs related to this term loan of $1,133 and $2,260 for the three and six months ended June 30, 2016, respectively. This term loan includes an accordion feature under which maximum borrowings may be increased to up to $400,000 in certain circumstances. We also have a $350,000 term loan, which we borrowed in 2014. This term loan matures in January 2020 and is prepayable without penalty at any time. This term loan requires annual interest to be paid at LIBOR plus a premium of 140 basis points that is subject to adjustment based upon changes to our credit ratings. As of June 30, 2016, the annual interest rate payable on amounts outstanding under this term loan was 1.9%. The weighted average annual interest rate for amounts outstanding under this term loan was 1.9% and 1.6% for the three months ended June 30, 2016 and 2015, respectively, and 1.9% and 1.6% for the six months ended June 30, 2016 and 2015, respectively. We incurred interest expense and other associated costs related to this term loan of $1,635 and $1,449 for three months ended June 30, 2016 and 2015, respectively. We incurred interest expense and other associated costs related to this term loan of $3,249 and $2,823 for six months ended June 30, 2016 and 2015, respectively. This term loan includes an accordion feature under which maximum borrowings may be increased to up to $700,000 in certain circumstances. Our revolving credit facility and term loan agreements and our senior unsecured notes indentures and their supplements provide for acceleration of payment of all amounts due thereunder upon the occurrence and continuation of certain events of default, such as, in the case of our revolving credit facility and term loan agreements, a change of control of us, which includes The RMR Group LLC, or RMR LLC, ceasing to act as our business manager and property manager. Our revolving credit facility and term loan agreements and our senior unsecured notes indentures and their supplements also contain a number of covenants, including covenants that restrict our ability to incur debts, and generally require us to maintain certain financial ratios, and our revolving credit facility and term loan agreements restrict our ability to make distributions under certain circumstances. We believe we were in compliance with the terms and conditions of the respective covenants under our revolving credit facility and term loan agreements and our senior unsecured notes indentures and their supplements at June 30, 2016. In January 2016, we prepaid, at par plus accrued interest, a $6,115 mortgage note secured by one of our properties with a maturity date in April 2016 and an annual interest rate of 5.97%. In April 2016, we prepaid, at par plus accrued interest, an $18,000 mortgage note secured by one of our properties with a maturity date in July 2016 and an annual interest rate of 4.65%. In July 2016, we prepaid, at par plus accrued interest, an $11,871 mortgage note secured by one of our properties with a maturity date in November 2016 and an annual interest rate of 6.25%. Also in July 2016, we gave notice of our intention to prepay, at par plus accrued interest, two mortgage notes secured by two of our properties with an aggregate principal balance of approximately $79,957, maturity dates in November 2016 and a weighted average annual interest rate of 5.92%; we expect to make these prepayments in September 2016.

Note 5. Indebtedness

Our principal debt obligations at June 30, 2016 were: (1) outstanding borrowings under our $1,000,000 unsecured revolving credit facility; (2) six public issuances of senior unsecured notes, including: (a) $400,000 principal amount at an annual interest rate of 3.25% due 2019, (b) $200,000 principal amount at an annual interest rate of 6.75% due 2020, (c) $300,000 principal amount at an annual interest rate of 6.75% due 2021, (d) $250,000 principal amount at an annual interest rate of 4.75% due 2024, (e) $350,000 principal amount at an annual interest rate of 5.625% due 2042 and (f) $250,000 principal amount at an annual interest rate of 6.25% due 2046; (3) our $350,000 principal amount term loan due 2020; (4) our $200,000 principal amount term loan due 2022; and (5) $636,087 aggregate principal amount of mortgages (excluding premiums, discounts and net debt issuance costs) secured by 54 of our properties (55 buildings) with maturity dates between 2016 and 2043. The 54 mortgaged properties (55 buildings) had a carrying value (before accumulated depreciation) of $1,040,792 at June 30, 2016. We also had two properties subject to capital leases with lease obligations totaling $11,817 at June 30, 2016; these two properties had a carrying value (before accumulated depreciation) of $36,039 at June 30, 2016, and the capital leases expire in 2026.

In February 2016, we issued $250,000 of 6.25% senior unsecured notes due 2046, and raised net proceeds of approximately $241,350 after underwriting discounts and expenses. We used the net proceeds of this offering to repay in part the outstanding amount under our revolving credit facility and for general business purposes.

In July 2016, we entered into loan agreements and obtained an aggregate $620,000 secured debt financing that matures in August 2026. These loans are secured by one MOB (two buildings) located in Massachusetts and require interest at a weighted average fixed annual interest rate of 3.53%. We used the net proceeds from these loans to repay in part the outstanding amount under our revolving credit facility and for general business purposes. The loan agreements contain customary covenants and provide for acceleration of payment of all amounts due thereunder upon the occurrence and continuation of certain events of default.

We have a $1,000,000 revolving credit facility that is available for general business purposes, including acquisitions. The maturity date of our revolving credit facility is January 15, 2018 and, subject to our payment of an extension fee and meeting other conditions, we have an option to extend the stated maturity date by an additional year to January 15, 2019. Our revolving credit facility provides that we can borrow, repay and re-borrow funds available under our revolving credit facility until maturity, and no principal repayment is due until maturity. Our revolving credit facility requires annual interest to be paid on borrowings at LIBOR plus a premium, which was 130 basis points as of June 30, 2016, plus a facility fee of 30 basis points per annum on the total amount of lending commitments. Both the interest rate premium and the facility fee are subject to adjustment based upon changes to our credit ratings. As of June 30, 2016, the annual interest rate payable on borrowings under our revolving credit facility was 1.7%. The weighted average annual interest rates for borrowings under our revolving credit facility were 1.7% and 1.5% for the three months ended June 30, 2016 and 2015, respectively, and 1.7% and 1.5% for the six months ended June 30, 2016 and 2015, respectively. As of June 30, 2016, we had $749,000 outstanding and $251,000 available for borrowing, and as of August 4, 2016, we had $100,000 outstanding and $900,000 available for borrowing under our revolving credit facility. We incurred interest expense and other associated costs related to our revolving credit facility of $3,454 and $2,063 for the three months ended June 30, 2016 and 2015, respectively. We incurred interest expense and other associated costs related to our revolving credit facility of $7,136 and $3,003 for the six months ended June 30, 2016 and 2015, respectively. Our revolving credit facility includes an accordion feature pursuant to which maximum borrowings under the facility may be increased to up to $1,500,000 in certain circumstances.

We have a $200,000 term loan, which we borrowed in 2015. This term loan matures in September 2022 and is prepayable without penalty beginning September 29, 2017. This term loan requires annual interest to be paid at LIBOR plus a premium of 180 basis points that is subject to adjustment based upon changes to our credit ratings. As of June 30, 2016, the annual interest rate payable for amounts outstanding under this term loan was 2.3%. The weighted average annual interest rate for amounts outstanding under this term loan was 2.3% for both the three and six months ended June 30, 2016. We incurred interest expense and other associated costs related to this term loan of $1,133 and $2,260 for the three and six months ended June 30, 2016, respectively. This term loan includes an accordion feature under which maximum borrowings may be increased to up to $400,000 in certain circumstances.

We also have a $350,000 term loan, which we borrowed in 2014. This term loan matures in January 2020 and is prepayable without penalty at any time. This term loan requires annual interest to be paid at LIBOR plus a premium of 140 basis points that is subject to adjustment based upon changes to our credit ratings. As of June 30, 2016, the annual interest rate payable on amounts outstanding under this term loan was 1.9%. The weighted average annual interest rate for amounts outstanding under this term loan was 1.9% and 1.6% for the three months ended June 30, 2016 and 2015, respectively, and 1.9% and 1.6% for the six months ended June 30, 2016 and 2015, respectively. We incurred interest expense and other associated costs related to this term loan of $1,635 and $1,449 for three months ended June 30, 2016 and 2015, respectively. We incurred interest expense and other associated costs related to this term loan of $3,249 and $2,823 for six months ended June 30, 2016 and 2015, respectively. This term loan includes an accordion feature under which maximum borrowings may be increased to up to $700,000 in certain circumstances.

Our revolving credit facility and term loan agreements and our senior unsecured notes indentures and their supplements provide for acceleration of payment of all amounts due thereunder upon the occurrence and continuation of certain events of default, such as, in the case of our revolving credit facility and term loan agreements, a change of control of us, which includes The RMR Group LLC, or RMR LLC, ceasing to act as our business manager and property manager. Our revolving credit facility and term loan agreements and our senior unsecured notes indentures and their supplements also contain a number of covenants, including covenants that restrict our ability to incur debts, and generally require us to maintain certain financial ratios, and our revolving credit facility and term loan agreements restrict our ability to make distributions under certain circumstances. We believe we were in compliance with the terms and conditions of the respective covenants under our revolving credit facility and term loan agreements and our senior unsecured notes indentures and their supplements at June 30, 2016.

In January 2016, we prepaid, at par plus accrued interest, a $6,115 mortgage note secured by one of our properties with a maturity date in April 2016 and an annual interest rate of 5.97%. In April 2016, we prepaid, at par plus accrued interest, an $18,000 mortgage note secured by one of our properties with a maturity date in July 2016 and an annual interest rate of 4.65%. In July 2016, we prepaid, at par plus accrued interest, an $11,871 mortgage note secured by one of our properties with a maturity date in November 2016 and an annual interest rate of 6.25%. Also in July 2016, we gave notice of our intention to prepay, at par plus accrued interest, two mortgage notes secured by two of our properties with an aggregate principal balance of approximately $79,957, maturity dates in November 2016 and a weighted average annual interest rate of 5.92%; we expect to make these prepayments in September 2016.